#dancing hands

Reality Rating: 1 (Jaspar can and does occasionally summon echoes as mounts, but wouldn't be interested in a race, nor would these echoes be very suited to one)

Jaspar can bring forth echoes of animals from parts of them, and he's been known to use antlers in the past. While those echoes are temporary until the life left in them is consumed by the magic, they can be pretty versatile, and it's not difficult to imagine Jaspar switching to a few different echoes along the length of the race. That is, if he cared any about all that. Or if they were fast enough to compete, they're mostly as fast as the animals they're summoned from the echoes of. Though they are tireless as long as they last.

Ranek

Reality Rating: 2 (I'm sure Ranek has built an extension to the Stormplate for speed at some point over the last couple centuries. And if he's not, he might if he heard of the race, could get there and thought it a fitting test. He did not actually participate in the race.)

Ranek already has his Stormplate, which is closer to a mech suit than a typical suit of armor. Given his tendency to create magical wonders, the Stormframe Sprinter is an extension to it built for speed and maneuverability. Likely able to shift the bipedal gait to a more effective quadrupedal one for bursts of acceleration. It would be a fearsome contestant in any race it entered, leaping to speeds on par with wheeled vehicles on the road but able of much more agility in rough terrain.

Ranek, who is fond of occasions to prove himself, might even have joined the Grand Prix... But he's currently desparked, mostly retired, and living back home on Kaldheim. He might not have heard of the race, or not in time, or maybe he simply didn't have a ready Omenpath to join it, or lacked a team... Whatever the reasons, he didn't show up for the event.

Jibea

Reality Rating: 0 (Any tech Jibea might have to help their gravity magic would be wearable, not a vehicle, this tech doesn't exist on their home plane anyway, and they'd be unlikely to want to participate in the Grand Prix, even if they might watch it)

A Gravity Slider is designed to help you maneuver while in freefall, and survive any collision or landing. Maximize and minimize terminal velocity both depending on what you want at any given moment. The idea is to redirect gravity into whatever direction you want to go and simply fall towards your objective. Different parts are also designed to minimize or maximize contact friction with any object that passes by (typically the ground). Using the mass of a plane and gravity as its propellant, no fuel is required besides the magic that shifts those forces, that usually comes from the pilot. Something Jibea would very much be able to do, along with using their magic to mess with nearby contestants (or their weaponry) that are NOT made to handle shifting gravity fields.

With that said, as was mentioned in the Reality Rating, this kind of tech doesn't exist on Jibea's home plane, and they certainly didn't have it custom made elsewhere either. They're not really a racer, and there isn't much of a point to participate in those races for them, so it remains very much in AU territory. They do value the display of it and of all these different techniques and technologies and have followed the Grand Prix when possible. They were keeping an eye on the Endriders in particular, sharing some of their plights.

Madaya

Reality Rating: 1 (The Mirage Machine may have existed, though it wasn't a racing Vehicle, and would have likely been sold off at some point. And Madaya isn't a racer)

Back in the days where she was a magician (as in, a stage magician), Madaya may have bought or commissioned the mirage machine from one of the many ambitious inventors on Avishkar. Both something to store her equipment and something capable of projecting room-spanning illusions for her to integrate into some of her more involved spectacles. Sadly, times became rough, she might have had to live off of her mirage machine for a bit, then when the situation became untenable, she likely had to sell it off years ago, before she hit rock bottom and sparked.